Determination of Weak Acid Dissociable Cyanide in Water by Fluorescence Spectrophotometry with Microfluidic Laminar Flow

Thiol and sulfion in the sample was removed by activated carbon absorption-lead ion precipitation method, and the sample was treated with the multi-flow parallel laminar flow based on double-Ψ microfluidic (laminar flow not more than 18.0 μg·L^-1) chip. CN^- in the sample was determined by fluorescence spectrophotometry. As shown by the results, trace weak acid dissociable (WAD) cyanide in water had an efficient transfer by laminar flow with high mass transfer efficiency. Linear range of CN^- was found to be 1.00-10.00 μg·L^-1, with detection limit (3s/k) of 0.12 μg·L^-1. Test for recovery was made by the standard addition method using river water as matrix, giving results of 99.5%, 102%, with RSDs (n=6) less than 3.5%.